java - 数组缓冲区对象被禁用

Question

我尝试创建 3D 立方体，其中存储有 xpos、ypos、类型和 modelInstance。当我尝试运行该程序时，出现此错误:

Exception in thread "LWJGL Application" org.lwjgl.opengl.OpenGLException: Cannot use offsets when Array Buffer Object is disabled

如何启用它？

这是我收到错误的类:

package com.me.the_unknown;

import java.util.ArrayList;

import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.graphics.g3d.Model;
import com.badlogic.gdx.graphics.g3d.ModelBatch;
import com.badlogic.gdx.graphics.g3d.ModelInstance;
import com.badlogic.gdx.graphics.g3d.materials.Material;
import com.badlogic.gdx.graphics.g3d.materials.TextureAttribute;
import com.badlogic.gdx.graphics.g3d.utils.ModelBuilder;

public class Blocks {

    public static ArrayList<Float> blockX = new ArrayList<Float>();
    public static ArrayList<Float> blockY = new ArrayList<Float>();
    public static ArrayList<Integer> blockType = new ArrayList<Integer>();
    public static ArrayList<ModelInstance> blockModelInstance = new ArrayList<ModelInstance>();

    public static ModelBatch modelBatch;
    private static ModelBuilder modelBuilder;

    //Textures
    public static Texture stonebrick = new Texture("data/blocks/stonebrick.png");
    public static Texture gravel = new Texture("data/blocks/gravel.png");

    public static void addBlock(int xpos, int ypos, int type) {
        blockX.add((float) xpos * 5);
        blockY.add((float) ypos * 5);
        blockType.add(type);
        updateBlocks();
    }

    private static void updateBlocks() {
        blockModelInstance.clear();

        for(int counter = 0; counter < blockX.size(); counter++){
            Model model = null;
            ModelInstance instance;

            if(blockType.get(counter) == 1)
                model = modelBuilder.createBox(5f, 5f, 5f, new Material(TextureAttribute.createDiffuse(stonebrick)), Usage.Position | Usage.Normal | Usage.TextureCoordinates | Usage.Generic);
            if(blockType.get(counter) == 2)
                model = modelBuilder.createBox(5f, 5f, 5f, new Material(TextureAttribute.createDiffuse(gravel)), Usage.Position | Usage.Normal | Usage.TextureCoordinates | Usage.Generic);

            instance = new ModelInstance(model);
            blockModelInstance.add(instance);

            model.dispose();
        }
    }

    public static void create() {
        modelBuilder = new ModelBuilder();
        updateBlocks();
    }
}

Answer 1

您正在创建一个模型，然后创建它的模型实例，然后处置该模型，这实际上使模型实例无法使用，因为它依赖于模型。

确保模型的生命周期比依赖于它的模型实例的生命周期长，因为它管理着它们的资源。在您的情况下，ModelInstance 将无效，因为它所依赖的 Mesh 是通过调用 model.dispose() 来处置的，从而导致您收到错误。

还要尽量避免静态，当您的应用关闭然后再次重新启动时，它可能会导致设备出现问题。